Pendulum.



T. ROSS.

PENDULUM.

APPLIUATION FILED 11u29, 1914.

1,130,435. Patented Mar. 2, 1915.

TOREY ROSS, OF CHICAGO, ILLINOIS.

PENDULUM.

Specicaton of Letters Patent.

Patented Mar. 2, 1915.

Application filed May 29, 1914. Serial No. 841,703.

T0 all whom t may concern.'

Be it known that I, Tomar Ross, a citizen of the United States ofAmerica, and a resident of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inPendulums, of which the following is a specification.

My invention relates to pendulum adjustment for clocks and has for itsobject improvements in such devices.

In the accompanying drawings Figure 1 is the front elevation of a clockshowing a pendulum having my improvements; Fig. 2 is an enlarged frontelevation of the bob and a portion of the pendulum rod; Fig. 3 is a rearelevation of Fig. 2; F ig. l is a section on line 1 /l of F ig. 2; andEig. 5 is an enlarged detail.

The bob 6 has a finished rear face and a central rear recess 7 in whichis located a spring washer 8. Extending through the center of the bob isa bolt or spindle 9, the head of which is in the form of a pinion 17bearing against the outer face of the washer 8. A nut 10 and lock nut 11serve to compress the washer 8 to produce any desired degree offrictional resistance to the turning of the spindle or bolt 9. The nut10 is a built up nut, one part of which consists of a hand or pointer 12which extends over a graduated scale 13 on the front face of the bob G.

The lower end of the pendulum rod 14 consists of a hat bar 15 having aslot 16 through which the pinion 17 extends to engage a rack 1S securedon the outer rear face of the bar 15. The bar 15 is secured in itsproper relationship to the pinion 17 by means of shouldered screws 19which pass through the slot 16 into the finished rear face of the bob 6.These screws 19 do not clamp the bar 15 and the bob 6 together, butpermit a free sliding of one upon the other so that the weight of thebob rests solely on the rack 18 by engagement of the teeth of the piniontherewith.

rhe pinion 17 and the washer 8 may be secured together by brazing orotherwise, and are preferably so connected. With the nut 10 screwed downto put a moderate amount of tension upon the washer 8, and the lock nutscrewed tight against the nut 10, it will be evident that the parts 8,9, 10, 11, 12 and 17 are in eifect one piece which may be turned by handbut which furnishes frictional resistance to such turning. It

will also be evident that by manually moving the hand or arm 12 over thedial 13 the bob will be raised or lowered to make the clock run fasteror slower. It will be further evident that by reason of the looseness ofthe connection between the bob and the bar 15 there will be no lostmotion in raising or lowering the bob but that its weight will alwaysrest directly on the teeth of the rack 18.

The graduations on the dial 13 have a definite relationship to the pitchcircumference of the pinion and the mathematically perfect length ofpendulum on which they are to be used. This relationship is such thatupon moving the hand 12 a distance corresponding to the distance betweentwo adjacent long graduation marks on the dial the clock will run fasteror slower by the amount of one minute per day. The finer graduations arepreferably one-eighth of the coarser graduations with the result thatupon a manual adjustment of the hand 12 a distance corresponding to thedistance between two marks on the liner scale the clock will run fasteror slower by the amount of one minute in eight days.

What I claim is:

1. The combination with a pendulum and a bob having a loose slidingconnection with each other, of a rack and pinion by which the bob israised and lowered on the rod, said rack and pinion being so arrangedthat the weight of the bob is at all times supported by contact betweenthe teeth of said rack and pinion, from turning under the weight of thebob, a manually operated device connected to the pinion by which it maybe turned to adjust the bob on the rod, and an indicator for suchadjustment.

2. The combination with a pendulum rod and a bob, of a rack secured tothe rod, a pinion having a bearing in the bob, manually operated meansfor turning said pinion to move the bob on the rod, and a frictionalconnection serving to restrain the pinion from turning when the weightof the bob is supported on the teeth of the rack.

3. The combination with a pendulum rod and a bob, of a rack secured tothe rod, a pinion supported on the teeth of the rack and having abearing in the bob, a spring washer secured to the pinion and engagingthe bob to furnish resistance to turning the pinion in its bearing,means for adjusting the tension of the washer to vary the frictionalresistanoe, means by which the;pinion V sion, anindicating hand seeui'edto the shaft 10 may be manually adjusted, and a scale for Vand loatedadjacent to the front face of indicating the amount of such adjustment.the bob, and'a Vscale in the path of the hand.

4. The combination With a pendulumy rod Signed at Chicago, Illinois7this 27th day and a bob, of a rack secured to the rod, an of May, 1914.axial shaft extending through the bob and f TOREY RUSS. havinga pinionengaging the raek, a lspiing W'itnesses: Washer between the pinion andthe bob, a C; LREDFIELD, nut by Which the Washer is put under ten- JAMESC. REDFLELD.

Copiesof this patent may be obtained fonve cents eiah, byk addressingthe @Commissioner of Patents.

Y Y Washington, D. C.

